20951166 has 24 divisors (see below), whose sum is σ = 43472520. Its totient is φ = 6723472.

The previous prime is 20951159. The next prime is 20951171. The reversal of 20951166 is 66115902.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60205 + ... + 60551.

It is an arithmetic number, because the mean of its divisors is an integer number (1811355).

Almost surely, 2^20951166 is an apocalyptic number.

20951166 is an abundant number, since it is smaller than the sum of its proper divisors (22521354).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20951166 is an equidigital number, since it uses as much as digits as its factorization.

20951166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728 (or 381 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 20951166 is about 4577.2443675207. The cubic root of 20951166 is about 275.6783956178.

The spelling of 20951166 in words is "twenty million, nine hundred fifty-one thousand, one hundred sixty-six".